What do my fellow POTN'rs think of this setup, budget willing?
1D Mark IV or 1Dx (when its released) combined with the Canon 28-300L and a second body with a fast prime of your choosing.
I would think that this setup would cover 90% of most wedding photographers needs especially with the high iso technology that these cameras now have and when low light becomes an issue, you could always switch over to fast primes.